Basf Aktiengesellschaft

Basf Se Corporation

Matthias Klüglein

Bernd Bruchmann

Maria Scherer

Matthias Kroner

Matthias Bratz

Helmut B Witteler

Günter Oetter

Stefan Becker

Frank Dietsche

Norbert Wagner

Stephan Hüffer

Gerhard Wolf

Sebastian Koltzenburg

Hansulrich Reisacher

Darijo Mijolovic

Joachim Jesse

Ingo Klopp

Harald Köhle

Marianna Pierobon

Peter Danisch

Frank Klippel

Gunther Pabst

Cordula Mock-Knoblauch

Nathalie Bouillo

Alexander Göthlich

Wolfgang Best

Ludwig Völkel

Susanne Petrovic

Lysander Chrisstoffels

Benno Sens

Andreas Fechtenkötter

Christian Krüger

Andres Carlos Garcia Espino

Ronald Frans Maria Lange

Izaskun Manteca Di Zuazo

The present invention relates to a composition for treating surfaces, comprising a copolymer as component A, synthesized from (meth)acrylic acid or salts thereof, a carboxylate-containing monomer and/or monomers containing groups containing phosphoric and/or phosphoric acid or salts thereof, and further comonomers if desired, to a passivating layer on a metal surface, which comprises component A, to a process for forming said passivating layer, and to the use of the composition of the invention to passivate a metal surface.

Carboxylate-containing polymers for metal surface treatment

The present invention relates to a substantially chromium-free process for passivating metallic surfaces of Zn, Zn alloys, Al or Al alloys by treating the surface with an acidic aqueous formulation which comprises at least one substantially noncrosslinked, water-soluble polymer or copolymer containing at least 50% by weight of (meth)acrylic acid units and comprises water or an aqueous solvent mixture comprising at least 50% by weight of water, and by further treating the surface with at least one water-soluble crosslinker comprising at least 2 crosslinking groups selected from the group consisting of azirane, oxirane, and thiirane groups. The invention further relates to passivating layers obtainable by means of the process and to a formulation suitable for this process.

Essentially chromium-free method for passivating metallic surfaces consisting of Zn, Zn alloys, Al or Al alloys

The present invention relates to a passivating layer on a metal surface, obtainable by contacting the metal surface with a composition comprising a water-soluble nitrogenous polymer, to a surface composed of a metal surface and the passivating layer of the invention, to a process for forming a passivating layer on a metal surface, to the use of a composition comprising a water-soluble nitrogenous polymer to passivate a metal surface, and to a system on a metal surface that comprises a passivating layer of the invention and further coating films.

Nitrogenous polymers for metal surface treatment

The present invention relates to a composition for treating surfaces, comprising a copolymer as component A, synthesized from (meth)acrylic acid or salts thereof, a carboxylate-containing monomer and/or monomers containing groups containing phosphoric and/or phosphonic acid or salts thereof, and further comonomers if desired, to a passivating layer on a metal surface, which comprises component A, to a process for forming said passivating layer, and to the use of the composition of the invention to passivate a metal surface.

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Ludwigshafen, Germany

Matthias Klüglein